S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))

S: (n) part, portion, component part, component, constituent (something determined in relation to something that includes it) "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton"

S: (n) relation (an abstraction belonging to or characteristic of two entities or parts together)